package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.FlavorsMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private FlavorsMapper flavorsMapper;

    @Autowired
    private SetmealDishMapper setMealDishMapper;
    /**
     * 新增菜品和口味
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavors(DishDTO dishDTO) {
//        创建菜品对象
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
//        插入单个菜品
        dishMapper.insert(dish);
        long dishId = dish.getId();

//        获得口味集合
        List<DishFlavor> flavors = dishDTO.getFlavors();
//        判断是否有口味
        if(flavors != null && !flavors.isEmpty()){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            flavorsMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult page(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 根据id批量删除菜品
     * @param ids
     */
    @Transactional
    public void delete(List<Long> ids) {
//        判断该菜品是否为启售状态，启售则无法删除
        for (Long id : ids) {
            Dish dish = dishMapper.selectById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
//        判断该菜品是否有关联的套餐，有关联套餐则无法删除
            List<Long> setMealIds = setMealDishMapper.selectSetMealIdByDishId(ids);
            if(setMealIds != null && !setMealIds.isEmpty()){
                throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
            }

//        删除菜品，及关联的口味
        dishMapper.deleteByIds(ids);
        flavorsMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品和菜品的口味
     * @param id
     * @return
     */
    public DishVO getDishWithFlavors(Long id) {
        Dish dish = dishMapper.selectById(id);
        List<DishFlavor> dishFlavors = flavorsMapper.selectById(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 修改菜品
     * @param dishDTO
     */
    @Transactional
    public void update(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
//        修改菜品信息
        dishMapper.update(dish);

//        删除口味添加口味
        List<Long> dishIds = new ArrayList<>();
        dishIds.add(dishDTO.getId());
        flavorsMapper.deleteByDishIds(dishIds);

//        添加口味
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && !flavors.isEmpty()){
            flavors.forEach(flavor -> {
                flavor.setDishId(dishDTO.getId());
            });
            flavorsMapper.insertBatch(flavors);
        }

    }

    /**
     * 根据分类查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> selectByCategoryId(Integer categoryId) {
        List<Dish> dishList = dishMapper.selectByCategoryId(categoryId);
        return dishList;
    }

    /**
     * 菜品的启售和停售
     * @param status
     * @param id
     */
    public void setStatus(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = flavorsMapper.selectById(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}
